Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 586

ONVOY, LLCV - MI 24

New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2023-06-22	586-368	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	ONVOY, LLCV - MI	543C	WARREN	MI
2023-06-02	586-352	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	MT CLEMENS	MI
2021-10-29	586-326	0XXX3XXX4XXX6XXX7XXX · 2 holders which blocks →	ONVOY, LLCV - MI	543C	RICHMOND	MI
2021-07-30	586-334	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	ROSEVILLE	MI
2021-07-20	586-325	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	NEWBALTIMR	MI
2021-06-25	586-304	0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 4 holders which blocks →	ONVOY, LLCV - MI	543C	NEW HAVEN	MI
2021-06-16	586-284	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	WASHINGTON	MI
2021-05-19	586-366	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLCV - MI	543C	ARMADA	MI
2021-01-06	586-355	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	RICHMOND	MI
2021-01-06	586-544	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	UTICA	MI
2019-10-10	586-500	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	NEWBALTIMR	MI
2017-10-06	586-800	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	ROSEVILLE	MI
2017-09-22	586-666	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	MT CLEMENS	MI
2016-03-23	586-571	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	CENTERLINE	MI
2016-03-15	586-250	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLCV - MI	543C	WARREN	MI
2016-03-14	586-371	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLCV - MI	543C	WASHINGTON	MI
2016-03-14	586-701	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	NEW HAVEN	MI
2015-12-11	586-257	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	MT CLEMENS	MI
2015-12-04	586-299	0–9 XXXall 10 · 2 holders which blocks →	ONVOY, LLCV - MI	543C	MT CLEMENS	MI
2015-07-24	586-999	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	WARREN	MI
2015-07-23	586-333	0–9 XXXall 10 · 3 holders which blocks →	ONVOY, LLCV - MI	543C	MT CLEMENS	MI
2014-03-27	586-217	0–9 XXXall 10 · 5 holders which blocks →	ONVOY, LLCV - MI	543C	ROSEVILLE	MI
—	586-303	0–9 XXXall 10 · 6 holders which blocks →	ONVOY, LLCV - MI	543C	WARREN	MI
—	586-327	0–9 XXXwhole prefix which blocks →	ONVOY, LLCV - MI	543C	ROSEVILLE	MI

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.